Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.
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Donald M. Jones / American Bison (Bison bison) dust bathing, National Bison Range, Montana
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Nick Garbutt / Male American Bison (Bison bison) walking through snow. Firehole River Valley, Yellowstone National Park, Wyoming, USA. January
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Sebastian Kennerknecht / American Bison (Bison bison) herd grazing in winter, Gardiner, Yellowstone National Park, Montana
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Sebastian Kennerknecht / American Bison (Bison bison) herd grazing in winter, Gardiner, Yellowstone National Park, Montana
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Sebastian Kennerknecht / American Bison (Bison bison) bull browsing in winter, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female cleaning nose with tongue, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female in winter, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female covered with frost in winter, Yellowstone National Park, Montana
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Sebastian Kennerknecht / American Bison (Bison bison) female in snow, Riding Mountain National Park, Manitoba, Canada
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Jim Manthorpe / American bison (Bison bison) feeding, Yellowstone National Park, Wyoming, USA, August.
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Donald M. Jones / American Bison (Bison bison) bull, National Bison Range, Montana